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External connectors

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Matteo Fumagalli edited this page Jul 20, 2017 · 5 revisions

To connect external devices KITRA 520 has two side connectors, as show below:

FUNCTIONAL NOTES ON EXPANSION CONNECTOR LINES

  • Lines DOUT1-PWM/DOUT2/DOUT3/DOUT4-PWM have 330ohm internal resistor so maximum current per output is 10mA.
  • Lines DIN1/DIN2/DIN3/DIN4 have 330ohm series resistor and after those have 10kohm internal pull-up.
  • Lines ANI_1/ANI_2/ANI_3/ANI_4 have 10kohm pull down and don’t have protection series resistor, the lines are directly connected to the port pin of the microcontroller STM32F411.
  • I2C1_SDA/I2C1_SCL have 2,2kohm internal pull up to 3,3V. This digital communication interface is connected to STM32F411 and to internal circuits also (LRA motor control, capacitive touch inputs, pressure sensor, humidity sensor, RGB LED controller, proximity sensors).

**IMPORTAN NOTE ** USART2 can be used as serial COM in boot mode for STM32F411 when BOOT0 pin is at 3,3V level after power on. If pin BOOT0 is low level (0V) after power on, USART2 can be used as normal serial COM. Please, don’t use this port for KITRA-COM firmware upgrade, follow the dedicated procedure using Samsung ARTIK 520 script. The specific process for MCU firmware upgrade in case of a new KITRA-COM release is defined by a specific document that can be found on: https://github.com/rushup/kitra520/wiki/Firmware-upgrade

For more information check the Kitra520 datasheet.

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